Why is it that people have different skin in every part of the earth

It is related to climate, longitude, and latitude.

The "**" of the earth refers to the soil layer on the surface of the earth, which is a layer of soil in the soil profile that is roughly parallel to the ground, and is named because it surrounds the earth like "**". There are two reasons for the formation of soil layers: one is the soil layer formed by natural causes, and the other is the soil layer formed by cultivation reasons.

Each soil layer is significantly different from the above and below the soil layer in terms of color, structure, texture, adhesion, type and number of organisms, and pH, which can reflect the physical, chemical and biological characteristics of each soil layer, but in the same soil profile, each soil layer is closely related to each other and has continuity.

Why are people's skin colors different.

When you watch TV, you see people who are black, white, and people of other skin tones, and why are their skin tones different from ours?

If you've studied geography or read other children's books, you'll know that there are many different types of skin tones, including black, yellow, red, white, and brown. People of the same race are also very different.

For example, yellow people also have a whiter or darker skin color, although due to different seasons, different environments, and pathological influences and other factors, people's skin color is different, but the inherent skin color of the human body is determined by the genetics of the parents.

There are three factors that can change the color of **: the thickness of **, the amount of blood, and the pigment in **. In particular, the most important pigment is melanin, which can vary from yellow to black in the color range.

**It is divided into many layers, the one close to the outside is called the epidermis, and the one close to the inside is called the dermis, and the melanin is between the dermis and the epidermis.

If a person's melanin is both abundant and dense, it is darker; If there is less melanin, it will appear yellow; If there is very little melanin, it will appear white.

Human beings are like a mirror, reflecting their vitality and health status. People with different health conditions have different skin tones, and there are very obvious differences in skin color between different races. Yellow people have a pale yellow complexion; Black people have dark complexions; Caucasians' skin tones are light and pale in color.

So, why are there people of different skin colors in the world?

The color is mainly determined by the amount of melanin in it. Melanin is a black or brown particle, and its main role is to block the damage of ultraviolet rays in the sun's rays to the cells below the human body**. When the sun is stronger, the amount of melanin increases, so we get tanned in the summer.

The color of human beings is the result of adaptation to nature in the process of evolution. Africans living in the equatorial region, due to ** are often strongly affected.

When exposed to sunlight, a large amount of melanin is produced in the body, so Africans** are black. In the alpine land less, so, ** is white. Yellow people generally live in temperate regions, the intensity of sunlight is in the middle, and melanin is also in between, so the color of ** is also between the two people.

Scientists have found that there is no difference in the ancestors of human beings at the beginning, and the skin color is basically the same. It was only later that people moved to different regions and gradually developed differences in skin color in order to adapt to the outside environment.

People's ** is like a mirror, reflecting people's vitality and health status. People with different health conditions have different skin tones. There are also very obvious differences in skin color between different races.

Yellow people have a yellowish or brownish complexion; Black people have dark complexions; Caucasians' skin tones are mostly light and light, but there are also darker ones. So, how are different skin tones of different races formed?

The difference in skin color of people is due to the inconsistency of the amount and distribution of melanin. Melanin is an iron-free brown particle, mostly bound to proteins, and is found in the cells of the germinal layer of the epidermis, or some of them are found between cells. When the amount of melanin is large and concentrated in the germinal layer in the form of particles, the color of ** is black.

If the amount of melanin is high and its distribution extends to the particle layer, it is dark black. Conversely, if the germinal layer contains a small amount of melanin and is distributed in a scattered state, it is a light color. Caucasians** have the least amount of melanin, and it is scattered in the germinal layer, so the skin tone is the lightest, so that the color of the subcutaneous microvessels is revealed, and it often appears "flesh color".

The early formation of different skin tones is closely related to environmental influences. Anthropologists believe that humans evolved in the southern suburbs of Africa and Asia. The sun is abundant here, the ultraviolet rays are strong, and the people's ** is mostly black to resist the damage of strong sunlight.

With the migration of ancient humans, the skin color of people changed from dark to light, or from light to dark. With the development of human society, the role of geographical environment on the human body has been weakening. The skin color of different races is also related to genetics.

For example, Africans have a black color, a trait that can be maintained in their offspring, and although they migrated to the Americas or Europe, the black color is still inherited. In addition, the mixing of bloodlines can also give rise to new racial types. The Urals are a mixture of yellow and white people.

Dark skin tones have a certain protective effect on the human body, especially in tropical areas, which can make people better tolerate the strong exposure of ultraviolet rays and protect deep blood vessels and other tissues from damage.

Ethnicity is a group of people who share some common trait based on heritable human characteristics. Generally refers to biological divisions, not ethnic divisions. Why does the same earth produce people of different skin colors?

Do Africans get tanned? Are Europeans white-covered?

What races are there on Earth? At present, it is widely spread in 1735, the Swedish biologist Linnaeus, according to the different skin color and geographical location, the division of human races, a total of four races, namely the Asian yellow race, the African black race, the European white race, and the American red race.

In addition to the difference in skin color, the classification of people also takes into account the amount of body hair, whether the hair is curly, the color of the eyes, the shape of the nose, etc.

Why do different people have different skin tones? The difference in skin color is definitely not due to tanning, but due to genetic differences. At present, scientists believe that the differences in race are mainly due to adaptation to different climate differences, for example, Europeans have a high nose to warm the air entering the lungs, because they generally live in high latitudes.

Africans**black,In order to filter the ultraviolet rays in the sun,The sunlight is stronger near the equator,The ultraviolet rays in the sunlight are conducive to the body's production of vitamin D,And the black** is conducive to preventing the production of excessive vitamin D。

But in modern society, you can wear a mask when it's cold, there is heating and air conditioning at the door, it doesn't matter if your nose is high or not, any race can survive at high latitudes, and those who are not black can wear sunscreen clothing and sunscreen, so they can also grow near the equator and are not affected by skin color.

Is the classification of races scientific and rigorous? The division of races is not rigorous, and by observing the surrounding things, it will be found that yellow people also have darker skin tones, and most of the white people have yellowish skin tones, and there is no reproductive isolation between different races.

And the division of races can easily be used by people with ulterior motives as a tool to enslave other races, so the right thing to do is to ignore racial differences, especially in the era of globalization, the opportunity for mixed race is increasing, at this time, it is meaningless to talk about race. Maybe your ancestors had people of other colors, and we are all equal.

Because there is melanin under the human epidermis, he distributes melanin to various organs according to the various physique genetics of people, less is white, more is black, and melanin can also affect the color of human hair and eyes, hehe, this is what I saw on TV, hope.

The living environment is determined, and organisms are constantly changing their own structure and skin color according to natural conditions to adapt, which is the theory of evolution, such as the ,...... of black people in the tropicsLike Russia, you look at all whites.

The genes are not the same! The elementary party passed by - but it seems to be true.

The sun shines on different levels of intensity.

The world is big, and everyone has it.